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No Model.) 2 Sheets-Sheet 1 C. B. BOSWORTH. DEVICE FOR REGULATING FEED WATER.

N0. 14L741. Patented Dec. 2, 1890.

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(No Model.) V 2 Sheets-Sheet 2.

G. B. BOSWORTH. DEVICE FOR .REGULATING FEED WATER.

N0.'441,741. Patented'Dec. 2,1890.

Witnesses is 6mm;

i Unites States Patent Orrics.

CHARLES B. BOSWORTH, OF EVERETT, ASSIGNOR TO THE CROSBY STEAM GAGE AND VALVE COMPANY, OF BOSTON, MASSACHUSETTS.

CDEVECE FOR REGULATiNG FEED-WATER.

' SPECIFICATION forming part of Letters Patent No. 441,741, dated December 2, 1890.

Application filed llovember 1, 1890. Serial No. 370,005. (No model.)

To all whom it may concern.-

Be it known that 1, CHARLES 13. Boswonrn,

useful Improvements in a Device for Regulating Feedater; and I do hereby declare the following to be a full, clear, and exact description of the invention,-such as will enable others skilled in the art to which it appertains to make and use the same.

Figure l is a side elevation in which the several devices employed are shown in combination, viz: the steam-boiler A, the steami'eedpump B, with its throttle-valve C, the air-pump D, which is mounted on the feedpump'B and receives its motion therefrom, the air-pressure governor E, and the thermostat E. Fig. 2 is a top view of the airpressure governor E, and Fig. 3 is a vertical section throughthe axis of the governor. on the line a, Fig. 2, and Fig. 4 is a similar vertical section through the axis of the instrument on the line a b, Fig. 2, showing how the air-pressure is introduced into the pistonchamber of the governor. Fig. 5 is a modified shape of the thermostatic tube.

Secured to the boiler A is the usual water column M, the sight-g1ass of which is removed so as to clearly show the thermostat. Attached to this water column is the thermostat E, an enlarged view of which, though of somewhat changed shape, is shown in Fig. 5. This consists of an expansion-tube 8, having a pipe e for connection at the top with the water column and the pipe 6 at the bottom for a similar connection.

The form shown at Fig. 5 presents an arrangement of parts in which 6 is the expansion-tnbe, having a pipe-connection at either end, the upper one G leading to the steamspace and the lower one H to the water-space of a steam-boiler, these pipes being so attached that the proper water-level of the boiler will correspond to the longitudinal axis of the tube a, the water rising and falling in tube 6 conform-ably to the rise and fall of the water in the boiler, the water entering through pipe H and the steam through pipe G. The right-hand branch of the piecel is closed bya plug having a forked standard J 'projecting outward from it, providing a carrying-pivot for the lever p, the lower end ofwhich is connected by the tension-rodt to a fixed collar fat the opposite end of the tube 6. The upper end of the lever carries a set- .screw to regulate-the operation of the valvej under the action of the expansion-tube.

In the form at Fig. 5 the'spring e (shown in Fig. 1) is omitted, the strain on lever 19 and tension-rodt being governed by a setscrew q.

In Fig. l is shown the connection of the thermostat with the pump and throttle-valve governor. The pipe at leads from the valve 3' by the pipes b to the air-pump D and to the air-pressure governor E.

As shown in Figs. 2, 3, and 4, the upper part of the air-pressnre governor E is divided by a horizontal partition a into two chambers, the lower one (1 being occupied by a cylindrical piston c, and the upper one by the annular piston f. These two pistons are connected together by the central stem g and yoke h.

The upper cylinder contains oil and acts as a dash-pot to prevent a too rapid movement of the working parts when called into action. The space between the under side of partition a and the top of the cylindrical piston e containscompressed air,supplied bythe air-pump D, which is mounted upon the steam-pump l3, and from it receives its motion. The compressed air is conveyed to cylinder (1" by the pipe Z) Z) b b, and by a branch of this'pipe (shown at n n n it is conveyed to the airrelief valve j of the thermostat.

The air-pressure governor E is mounted upon the top of the throttle-valve casing of the steam-pump and governs the opening and closing of that valve, which is connected with the piston c by a screw-ended rod, which is inclosed in a strong spiral spring 1', the tension of which may be modified by means of the screw-nut]. At its lower end the spiral spring rests on the top of thepacking-box of the throttle-valve spindle at it. It will be understood that the downward pressure on the piston of cylinder (1 and the upward force exerted by the spiral spring t" are in direct opposition. The pipe K K and K conveys steam from the boiler to the steam-pump, and the pipe-I conveys the feed-water from the steam-pump to the boiler. The set-screw Z is to modify the passage of the oil by the piston f, and the petcock c on the pipe Z) is to modify the air-pressure within the air-pipes as may be desired.

The operation of the combined devices herein described is as follows: The steampump B having been put in motion, the airpump D, connected therewith, begins to force air into the pipes b and into the chamber (1" above the piston e. As the air-pressure accumulates in the chamber (1' the piston e is pressed doward against the eXpansi-veforce" of the spiral spring 1", and the throttle-valve O of the steam-pump being thereby partly closed, the movement ofithesteamand air pump pistonsis correspondingly retarded.

lfthe steam-pump is workiug too slow, the

water-line of the boiler will be lowered, so thatithe water in the expansion-tube e will run-into the boiler and be replaced by steam,v

which will expand the tube longitudinally, causing an outward movementof the upper end of the lever 19, whichwilllopen the airrelief valveij, let-ting air escape, when, under the'resilient action of the spiral spring t", the piston 6 will rise, opening the throttle-valve oflthesteam-pump and accelerating its 1110- tion. If the steam-pump is working too fast, the Water-line of the boiler will rise, so that steam contained in the expansiontube a will beexpelled therefrom by the incoming water, which will be cooled by radiation from the metal of the tube and will contract longitudinally, permitting the spring 0 to hold the air-reliefvalve j to its seat, preventing the escape of air from the pipes b and n and chamber cl of the governor. The air accumulation in chamber (1 will now press down the piston e against the resilient force of the spiral spring 1", partly closingthe throttlevalve of the steam-p11 mp and retarding its J110tiOIL- Having thus described my invention, what I claim is- As an improvement in boiler-feeders,-an;expansion-tube having ateach end a pipe; for communicating with 1theboiler, an air-valve and: alever attached, to such valveand to the tube, and means for connectingsaid:evalvc with a throttle-valve governor, as-setzfortln:

Intestimony whereof I affix my signatureain presence oftwoavitnessesr CHARLES B. 1303\V0R'llll.

Vitnesses JOSHUA 11. ll'llLLET'l, RALPH Wt FOSTER. 

